p89lpc9351 NXP Semiconductors, p89lpc9351 Datasheet - Page 51

• Manufacturer Part Number: p89lpc9351
• Description: 8-bit Microcontroller With Accelerated Two-clock 80c51 Core 8 Kb 3 V Byte-erasable ?ash With 8-bit Adc
• Manufacturer: NXP Semiconductors

NXP Semiconductors
P89LPC9351_1
Preliminary data sheet
Fig 20. ADC block diagram
AD10
AD11
AD12
AD13
V
ref(bg)
AD00
AD01
AD02
AD03
V
sen
8.3 Block diagram
8.4 PGA
8.5 Temperature sensor
Additional PGA module is integrated in each ADC module to improve the effective
resolution of the ADC. A single channel can be selected for amplification. The gain of PGA
can be programmable to 2, 4, 8 and 16. Please refer to
detailed specifications.
Register PGACONx and PGACONxB are used to for PGA configuration. Register
PGAxTRIM2X4X and PGAxTRIM8X16X provide trim value of PGA gain level. As
power-on, default trim value for each gain setting is loaded into the PGA trim registers. For
accurate measurements, offset calibration is required.
Please see the P89LPC9351 User manual for detail configuration, calibration, and usage
information.
An on-chip wide-temperature range temperature sensor is integrated with ADC0 module.
It provides temperature sensing capability of 40 C ~ 85 C. It is necessary to measure
the 1.2 V reference voltage via the ADC before measuring temperature. The reference
voltage, temperature sensor and AD03 input pin multiplex one input to PGA0. Please see
the P89LPC9351 User manual for detail usage of temperature sensor.
PGA1
PGA0
Anin00
Anin01
Anin02
Anin03
Anin10
Anin11
Anin12
Anin13
input MUX
input MUX
Rev. 01 — 19 November 2008
4
comp
comp
to comparators
+
–
+
–
DAC0
DAC1
8-bit microcontroller with 8-bit ADC
Table 10 “Static characteristics”
CCLK
P89LPC9351
SAR
SAR
8
8
© NXP B.V. 2008. All rights reserved.
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